Die-stock.



H. w. OSTER.

DIE STOCK.

- APPLICATION FILED NOV; 23. 1914.

1,150,449. Patented Aug. 17,1915.

ETNETE sra'rns arr oriue.

HERMIAN W. OSTER, OF CLEVELAND, QI-IIO, ASSIGNOR TO THE OSTERMANUFACTURING GOIiZEPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO. I

DIE-STOCK.

made-re.

Specification of Letters Patent.

atented Aug. 17, 1915.

Application filed November 23, 1914. Serial No. 873,433.

To all whom'it may concern Be it known that I, HERMAN W. OsTER, acitizen of the United States, residing at Cleveland, in the county ofCuyahoga and State of Ohio, have invented a certain new and usefulImprovement in Die-Stocks, of which the following is a full, clear, andeX- act description. 7

This invention is an improvement inthe kind of receding die stocks inwhich there is a work-holder, a die-carrier, which, as threads are beingcut, not only turns but moves longitudinally relative to the workholder,a cam plate for controlling the position of the dies, and an inclinedmember which controls the position of the cam plate and which rotateswith the die-carrier but does not move endwiserelative to theworkholder. There .are'numerous specific forms of receding die stocks ofthis character. One of these forms the subject matter of Letters Patent#ecasemam the drawing shows the present invention in a form particularlyapplicable to this specific die stock.

In operating a die stock of the class which this invention is designedto improve, the cam plate is caused to, or allowed to, slowly turn asthe threads are being cut, in such direction as is associated with thereceding movement of the dies. WVhen the threadcutting operation hasbeen completed, it is desirable to move the dies outward, therebycilitate the complete withholding of the dies from contact with thethreaded work while the die stock is being backed off, and the accuraterestoration of the dies to the required position for cutting the newthread; and the invention consists in construction of a combination ofparts shown in the drawing hereinafter described and definitely pointedout by the appended claims.

In the drawing Figure 1 is an end view of a die stock equipped with thepresent invention; Fig. 2 is a side elevation of said die stock; Fig. 3is a side elevation of certain parts shown in Fig. 2, with a cam-platecontrolling post shown partly in section; Fig. 4: is an enlarged endview of a part of the die stock shown in Fig. 1, when the cam-platecontrolling post and the movable sleeve thereon are sectioned in theplan indicated by line l in Fig. 3.

Referring to parts by letters, A represents a tubular die-carrier; l3radially movable dies carried thereby; C the cam plate rotatably"mounted on the diecarrier and engaging the dies to control theirposition. 4 D represents a tubular work-holder into which the threadedextension av of the diecarriei. screws. The work-holder is provided withthe customary clamping bars F for securing said work-holder to the pipeto be threaded. v

E represents a ring which is rotatably mounted upon the work-holder in agroove thereon, so as to be capable of rotating upon the work-holder butincapable of moving lengthwise thereon. Pins H fixed to the diecarrierand disposed parallel with the axis thereof, go through holes in saidring and thereby compel the ring to rotate with the die-carrier, butpermit the die-carrier to screw into the work-holder.

G represents 51H inclined post which passes through an inclined hole 0in an outwardly extended ear 0 of the cam plate C. To the extent abovedescribed the die stock shown is. substantially like the die stock whichforms the subject matterof the previously mentioned Patent #965,320.

K represents a sleeve which is mounted upon the free end of the post Gso as to be capable of longitudinal movement thereon. Near its lower endit is provided with an inwardly extended shoulder 76. A spring J lies inthe space between the post and this sleeve and is compressed between theshoulder 70 and the head of a screw 1 which screws into the end of thepost. The sleeve K has an enlarged head is on its outer end, which headis concentric with the post. This head lies in the hole 0 in cam platewhile the thread is being cut, and its outer inclined surface engageswith the sides of said hole and thereby causes or controls the slowdie-receding rotary movement of the cam plate. I

Fig. 2 shows the various parts of the die shoulder 70 which is affordedby the lower 'will be entirely clear of the work.

end of said head; and this will cause such a receding movement of thedies that they now the die-carrier is unscrewed from the w'orloholderthis cam plate engaging with this shoulder 70 will cause the sleeve tomove up on the post, (as shown in Fig. 3) the dies of course remainingin their withdrawn position. lVhen the die-carrier has been suiiicientlybacked off and has reached the position it must occupy to begin thecutting of the new thread, the cam plate may be turned to the left, asshown in F ig.

1 and Fig. 3. The upper end of the hole 0 will engage the side of thelower end of the head and stop the cam plate, and likewise the sleeve K,actuated by a spring J will move down on thepost and in the hole a toitsnormal position, and the cam plate and the dies will then be in therequired position for beginning the cutting of a new thread.

Having thus described my invention,

what I claim is:

l. The combination with a die stock having a work-holder, a die-carrierwhich turns and moves endwise relative to the workholder as threads arebeingcut, dies carried by said die carrier, a cam plate rotatablymounted on the die carrier for controlling the positions of the dies, aring which is rotatably mounted on the work-holder but is held againstlongitudinal movement thereon, means to compel the ring and die carrierto rotatein unison, and a cam platecontrolling member fixed to saidring, of a cam plate-engaging device movably mounted on said camplate-controlling member and having a surface which is inclined to theaxis of the die stock for engaging a part of said cam plate, and havinga shoulder beneath which the cam plate may be moved after a thread hasbeen cut.

2. The combination with a die stock having a work-holder, a die-carrierwhich turns and moves endwise relative to the workholder as threads arebeing cut, dies carried by said die-carrier, a cam plate rotatablymounted on the die-carrier for controlling the positions of the dies, aring which is rotatably mounted on the work-holder but is held againstlongitudinal movement Copies of this patent may be obtained for When athereon, means to compel the ring and die carrier to rotate in unison,and a cam platecontrolling member fixed to said ring, of a camplate-engaging device movably mounted on said cam platecontrollingmember and having a surface which is inclined to the, axis of the diestock for engaging a part of said cam plate, and having a shoulderbeneath which the cam plate may i rier to rotate in unison, and aninclined post fixed to said ring, of a sleeve slidably mounted on saidpost and having an ens larged head which passes through a hole in a partof the cam plate, the lower end of said head serving as a shoulderbeneath which a part of a cam plate may be moved when a thread has beencut andwith which the cam plate may engage when the diecarrier is beingbacked oil of the work.

4-. The combination with a die stock having a work-holder, a die carrierwhich turns and moves endwise relative to the workholder as threads arebeing cut, dies carried by said die-carrier, a cam plate rotatablymounted onthe die-carrier for controlling the positions of the dies, aring which is ro-' tatably mounted on the work-holder but is heldagainst longitudinal movement thereon,

means to compel theflring and die-carrier to,

rotate in unison, and a cam plate-controlling member fixed to said ringof a cam plate-engaging device movably mounted on said camplatecontrolling member and having a surface which is inclined to theaxis of the die stock for engaging a part of said cam plate and having ashoulder beneath which, the cam plate may be moved after a thread hasbeen cut, and a spring yieldingly holding said sleeve in workingposition.

In testimony whereof, I hereunto aflix my signature in the presence oftwo witnesses;

, HERMAN ROSTER.

Witnesses: a

R. B.- GEWKSTENY, Louis W. Bonvns.

five cents each, by addressing the Commissioner of Patents.

Washington, 110.

